User's Guide

not ideally located for sensor placement, sensors may take advantage of Power Over Ethernet, either
from a single power injector or a compliant switch. PoE injectors are available from Extreme Networksi.
If there are gaps in coverage, or if deployment cost is a factor (due to the required density of sensors or
the cost of wiring to place sensors in strategic locations), there are several relatively inexpensive
remedies. Where wiring for placement in an ideal location is impractical, employ additional sensors to
correct as necessary. FCC Rules regulate the use of antennas as aids to reception for the sensors, in
regard to the sensors 802.11 component. If antennas would greatly enhance the overall deployment,
contact Support for guidance on the best approach for antenna application, considering both
regulatory guidelines and the physical design of the sensors.
In either case, always use facility floor plans to indicate where sensors are placed and to indicate areas
where a coverage test was done.
Planning Your Sensor Placement
This section discusses the planning the placement of sensors.
Sensor Placement using ADSP
After you map out anticipated sensor locations, you can assess the eectiveness of coverage by
correlating site survey data and assumptions discussed previously. You can also use the test procedure
described here to validate sensor location.
Because sensors are passive devices that do not have the capability to transmit data, the process of
determining sensor coverage depends on a reverse site survey process in which a device introduces a
signal in your Wireless LAN, and then the signal is tracked through the facility using the deployed
sensors.
Prerequisites for Sensor Placement
You will need the following documents to help determine sensor placement:
• Floor Plans
• Existing Site Surveys
• Wiring layouts
• Regulatory rules and codes for wiring, construction, materials, etc., where applicable.
You will need the following tools:
• A laptop running AirDefense Mobile 4.0, or later, or Site Scanner.
• An 802.11a/g/n wireless device (wireless client or access point). The ideal output power for this
device (around 40 mW) would be that of a retail quality wireless client card or access point as these
are likely rogue candidates.
Note
A soft access point on a laptop is often an ideal target because it can be Locked On a
channel and is battery powered through being hosted on a laptop.
• Wiring layouts.
Planning Your Sensor Placement
Security
848 Extreme AirDefense User Guide for version 10.5.